package com.atguigu.gulimall.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.no.utils.PageUtils;
import com.atguigu.common.no.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    //找到路径
    @Override
    public Long[] findCAtelogPath(Long catelogIg) {
        List<Long> paths = new ArrayList<>();


        List<Long> parentPath= findParentPath(catelogIg, paths);
        Collections.reverse(parentPath);
        return  paths.toArray(new Long[parentPath.size()]);
    }

    private List<Long> findParentPath(Long catelogid, List<Long> paths) {

        paths.add(catelogid);
        CategoryEntity byid= this.getById(catelogid);
        if ((byid.getParentCid()) != 0) {

            findParentPath(byid.getParentCid(), paths);

        }

        return paths;



    }


    @Autowired
    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWichtree() {
       List<CategoryEntity> entities= categoryDao.selectList(null);

      List<CategoryEntity> level1Menus=entities.stream().filter(
              categoryEntity -> categoryEntity.getParentCid()==0
        ).map((menu)->{
            menu.setChildren(getChildrens(menu,entities));
          return menu;
              }
      ).sorted((menu1,menu2)->{
          return menu1.getSort() - menu2.getSort();
      }).collect(Collectors.toList());


        return  level1Menus;
    }

    //递归查找
    private  List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            //1、找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            //2、菜单的排序
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return children;
    }

    @Override
    public void removeMenuByIds(List<Long> longs) {
        //TODO 查询是否关联其他菜单
        categoryDao.deleteBatchIds(longs);
    }
}
